Montblanc - Meisterstück - Roller ball pen

Ballpoint pen from the German brand Montblanc. Iconic Meisterstück model.
The pen is in excellent cosmetic and functional condition despite its age.
The current refill is original Montblanc in black.
The pen bears Montblanc and Meisterstück engravings on the middle ring.
It also bears engravings on the clip ring that I could not read with the naked eye. With a magnifying glass I see BB 276143 (to confirm the 143) and W- Germany
For information, the pen was purchased from the official store in Paris before the year 2000.
Important note:
The pen bears discreet initials: D - N which are legible in the photos.